JP2010157045A - Fatal accident preventing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fatal accident preventing system that distinguishes and detects a thing invading into a railway without requiring man power and emergency-stops a train only when the thing is a falling person. <P>SOLUTION: This fatal accident preventing system includes a transmission-side leakage transmission line and receiving-side leakage transmission line arranged on both sides of the railway which the train approaches, an RF module for generating a transmission spectrum diffusion signal and transmitting it to the transmission-side leakage transmission line, and a sensor card for analyzing the variation in received leakage electric field and specifying the position of an invasion object. When the difference of the positions of the invasion object specified at time points before and after a predetermined cycle is less than a predetermined threshold, it is considered that there is an invader and an emergency stop of the train is commanded. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a personal injury prevention system for preventing a personal injury caused by a person falling from a platform of a station.

  Leakage coaxial cables, leaky waveguides, etc. are installed on both sides of the line as a device to detect human intrusion related to personal injury, and radio waves are transmitted from one leaky transmission line to the other leaky transmission line. To detect obstacles. Connect a transmitter that generates a pulse signal to one end of one leaky transmission line, and connect a receiver that receives a delayed signal depending on the position of the pulse signal to the same end of the other leaky transmission line Furthermore, a filter for extracting the envelope from the signal waveform is connected to the receiver, and a storage device for storing the envelope of the signal waveform when there is no obstacle is provided in advance, and the envelope and filter when there is no obstacle An arithmetic unit that detects the position of the obstacle from the differential waveform from the envelope taken out in (1) is provided (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 10-95338

  However, for those that disturb the electric field, trains entering other than the fallen person and workers who get off the track for maintenance and inspection are also detected, so only the fallen person is detected. There is a problem that the emergency stop cannot be made.

  An object of the present invention is to provide a personal injury prevention system that distinguishes and detects the possibility of intrusion into a railway line without borrowing human power, and that stops a train only when a person falls.

  The personal injury prevention system according to the present invention includes a transmission side leakage transmission path and a reception side leakage transmission path disposed on both sides of a line on which a train enters, and an RF for generating a transmission spread spectrum signal and transmitting it to the transmission side leakage transmission path. In a personal injury prevention system equipped with a module and a sensor card that analyzes the change in the received leakage electric field and identifies the position of the intruder, the difference in the position of the intruder identified before and after the predetermined period is less than the predetermined threshold At that time, the train is instructed to stop urgently because there is an intruder.

  The effect of the personal injury prevention system according to the present invention is to detect intruders by distinguishing them from trains and workers, and without having to search for a person who finds a fall or an emergency stop button, instantly and reliably detects intrusion into the track. It is possible to shorten the time from the intrusion event occurrence to the emergency train stop instruction. This shortening of the time will reduce the incidence of personal injury and lead to respect for human life, and it will also be possible to prevent diamond disruption.

  The best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a schematic configuration of a personal injury prevention system. FIG. 2 is a configuration diagram of a leakage electric field transmitting / receiving apparatus according to the present invention. FIG. 3 is a diagram illustrating a state in which a leaked radio wave is received. FIG. 4 is a diagram showing an example of the intrusion position detection concept according to the present invention. FIG. 5 is a diagram showing a specific example of a transmission signal according to the present invention. In addition, in each figure, the same code | symbol shows the same part.

As shown in FIG. 1, the personal injury prevention system according to the present invention is arranged at a predetermined position of the platform 1, an intrusion detection device 3 for detecting an intruder such as a person or a train entering the track 2 facing the platform 1. The RFID tag 4 is provided, a work permission transmitter 6 carried by a worker 5 entering the track for work and transmitting radio waves, and a train control device 7 for controlling the operation of the train.
The intrusion detection device 3 transmits / receives a leakage electric field, and when there is a change in the leakage electric field, the leakage electric field transmission / reception device 8 analyzes the intrusion of an abnormal intruder, a worker, or a train based on the specified position. A personal accident prevention device 9 is provided to prevent the train from entering when it is determined that the person is an abnormal intruder.
The RFID tag 4 stores position information indicating the position of the platform 1 at an interval of 10 m in the platform 1, and transmits the position information to the work permission transmitter 6 in response to polling from the work permission transmitter 6.
The work permission transmitter 6 periodically acquires position information from the RFID tag 4 that is nearby and transmits a radio wave modulated with the position information to the personal injury prevention device 9.

  The leakage electric field transmission / reception device 8 is disposed on the ground on the other side of the track 2 and on the other side of the track 2 under the two platforms 1 that sandwich the track 2 from which the train enters from both sides or on one side of the track 2. The transmission side leakage transmission path 11 and the reception side leakage transmission path 12, the RF module 13 that generates a transmission spectrum spread signal, the sensor card 14 that analyzes the change of the received leakage electric field and identifies the position, and the reflection of the transmission spectrum spread signal The transmission side terminator 15 for preventing the occurrence of errors due to the transmission side, and the reception side terminator 16 for preventing the occurrence of errors due to reflection of the transmission spectrum spread signal that has received the transmission spread spectrum signal.

  As shown in FIG. 3, the transmitting side leaky transmission line 11 and the receiving side leaky transmission line 12 forming a pair each have a plurality of leaking points 11TH, 11TH, 11TH scattered along the direction in which the leaky transmission line extends. ,..., 12TH, 12TH, 12TH,. And the electromagnetic wave leaked from the transmission side leaky transmission path 11 is propagating in the kamaboko-shaped space as shown in FIG. The height of the kamaboko-like space through which the radio wave propagates is equal to or less than the height of the platform 1, and the human being on the platform 1 does not affect the propagation of the radio wave.

  For the transmission side leakage transmission path 11 and the reception side leakage transmission path 12, for example, a commercially available leakage coaxial cable is used. Leakage locations 11TH, 11TH, 11TH,..., 12TH, 12TH, 12TH,. It is a through slot that penetrates.

As shown in FIG. 2, the RF module 13 includes a reference clock generation unit 21, a switch unit 22, a control unit 23, and a transmission spread spectrum signal generation unit 24.
The sensor card 14 includes a detection means 25, reference spread spectrum signal generation means 26-1 to 26-20, and correlation means 27-1 to 27-20.
For example, the detection range in the cable extension direction is set along the platform 1 of 200 m with an accuracy of 10 m.

  A reception-side leaky transmission path 12 that is arranged in parallel with the transmission-side leaky transmission path 11 and the transmission-side leaky transmission path 11 and receives a leaked radio wave from the transmission-side leaky transmission path 11 is connected. If it changes, it is determined that the intruder has entered.

Here, an example of the intrusion position detection concept will be described.
A commercially available leaky coaxial cable is used as the transmission side leakage transmission path 11 and the reception side leakage transmission path 12, and the transmission side leakage transmission path 11 and the reception side leakage transmission path 12 are laid along the line 2, as shown in FIG. In addition, for example, when one transmission pulse is transmitted from the RF module 13, the leaked radio wave leaking from the first (first) hole (through slot) of the transmission side leaky transmission line 11 is transmitted to the reception side leaky transmission line 12. The signal is received through the first (first) hole (through slot) and reaches the sensor card 14 as a reception signal, and the arrival time is ΔT1 after the transmission signal is transmitted.
Similarly, when one transmission pulse is transmitted from the RF module 13, the leaked radio wave leaking from the second hole of the transmission side leaky transmission line 11 passes through the second hole of the reception side leaky transmission line 12. It is received and arrives at the sensor card 14 as a reception signal, but the arrival time is ΔT2 after transmission signal transmission.
Similarly, the arrival time of the reception signal received through the third hole is ΔT3 after the transmission signal transmission.
These ΔT1, ΔT2, ΔT3,..., ΔT20, that is, arrival time (also referred to as delay time) ΔT, if the length of the leaky transmission path is known, the signal propagation speed is 300,000 km / sec. Can be easily obtained by calculation.

Therefore, in the sensor card 14, by storing data of arrival time (delay time) ΔT calculated in advance from the system configuration, if the received actual received signal is compared with the stored data, It is possible to determine whether the received signal has passed through the slot).
Further, when a person enters the area where the leaked radio wave exists, the leaked radio wave changes due to an intruder, such as a change in shape.
Therefore, if a change in the signal received by the sensor card 14 is detected, it is possible to detect and notify which position along the transmission side leakage transmission path 11 and the reception side leakage transmission path 12 has entered.

  However, the signal speed is extremely fast, and there is also a relationship with the detection operation speed of the sensor card 14, and actually, the transmission signal does not transmit a single pulse about once every few seconds. The detection accuracy can be improved by using a spread spectrum signal called a PN code, such as a coded signal composed of tens of thousands of random pulse trains. The same PN code may be transmitted repeatedly, or different PN codes may be transmitted one after another. The PN code itself is a publicly known code.

  When the PN code illustrated in FIG. 5 is used, the sensor card 14 phase-modulates a high-frequency carrier wave with the output of the RF module 13 that generates a spread spectrum signal, and outputs it to the transmission-side leaky transmission line 11. The radio wave output from the transmission-side leaky transmission line 11 is received by the reception-side leaky transmission line 12 via the leaked part and input to the sensor card 14. In the sensor card 14, the received radio wave is phase-calculated with a reference spread spectrum code related to the intrusion distance, and intruder detection including the intrusion distance is performed by a change in electric field strength.

  The sensor card 14 is configured in the product form of the sensor card 14 that is modularized by mounting an intrusion detection function on the substrate, and the number of the sensor cards 14 depends on the distance to be detected, for example, 100 m, 150 m, 200 m,. It can be supported by increasing (adding).

  A reference spread code having a delay time corresponding to an intruder measuring distance of 10 m (± 5 m) is generated from the reference clock generating means 21 by a plurality of reference spread spectrum signal generating means 26-1 to 26-20, and the reference spread code is generated. The reference spread spectrum signal spread-modulated with the code is output, and the reception side leaky transmission path 12 is composed of 20 correlation means 27-1 to 27-20 corresponding to the reference spread spectrum signal generation means 26-1 to 26-20. The received transmission spread spectrum signal and the reference spread spectrum signal are correlated, and when the phases coincide with each other, the correlation signal is output, and each of the inherent delays set in the reference spread spectrum signal generation means 26-1 to 26-20 When the fluctuation amount of the signal level of the correlation signal with respect to time is equal to or greater than the set value, the detecting means 25 detects that there is an intruder in a place with a 10 m (± 5 m) interval in the line. To know.

  In the first embodiment described above, 20 reference spread spectrum signal generating means 26-1 to 26-20 having a corresponding delay time set at a measurement distance of 10 m (± 5 m) are mounted and 20 corresponding thereto. By mounting the correlation means 27-1 to 27-20, the detection distance is set to 20 correlation numbers × detection distance 10 m (± 5 m) = 200 m while maintaining the detection accuracy ± 5 m with one intrusion detection device 3. The high-range intrusion detection device 3 can be obtained economically.

There are a train, a worker, and a person who accidentally dropped the object that enters the track 2 facing the platform 1. Since the train enters at a speed of about 20 km / h, it is determined that the train has entered when the difference between the positions detected by the intrusion detection device 3 at the front and rear twice corresponds to about 20 km / h. be able to.
On the other hand, since a person who has accidentally dropped or the like hardly moves after the fall, it is determined that the difference in position detected by the intrusion detection device 3 twice before and after is less than a predetermined threshold value and that the person has fallen or the like. Can do.
Since the worker carries the work permission transmitter 6 and the work permission transmitter 6 notifies the position, the worker detects the position detected by the intrusion detection device 3 and the work permission transmitter 6. The position is the same. This is used to prevent personal accidents by distinguishing trains, people, and workers.

FIG. 6 is a functional block diagram of the personal injury prevention apparatus 9 according to the present invention.
The personal injury prevention apparatus 9 starts a personal accident prevention procedure at a predetermined cycle. The personal injury prevention device 9 inquires of the intrusion detection device 3 whether or not an intruder has been detected, the position information obtaining means 31 for obtaining the detected position information when the intruder is detected, and the intruder is detected. If there is a radio wave from the work permission transmitter 6, it is received when the radio wave is transmitted, the position information of the work permission transmitter 6 is read from the received radio wave, and there is an intruder other than the worker. An operator confirmation means 32 for determining whether or not there is an intruder other than the operator, and whether or not it is the first detection of the intruder. The position information storage means 33 for ending the train, the train / person distinguishing means 34 for determining whether or not the difference between the position information stored at the time of the second detection and the current position information is greater than or equal to a predetermined threshold, and the difference When is greater than or equal to a predetermined threshold A train confirmation means 35 for judging that a car has entered and ending the accident prevention procedure, and a train for instructing the train control device 7 to stop the train judging that a person has entered the track when the difference is less than a predetermined threshold. Stop means 36.

FIG. 7 is a flowchart showing a personal injury prevention procedure executed by the personal injury prevention apparatus 9 according to the present invention.
Next, personal injury prevention procedures will be described.
While the train is operating, the accident prevention procedure is started at a predetermined cycle (for example, 0.5 seconds).
In step S1, the intrusion detection device 3 is inquired to determine whether or not an intruder has been detected. When no intruder is detected, the personal injury prevention procedure is terminated, and when an intruder is detected, the process proceeds to step S2.
In step S2, the position information where the intruder is detected is obtained.
In step S3, the presence / absence of a radio wave from the work permission transmitter 6 is determined. If there is a radio wave, the process proceeds to step S4. If there is no radio wave, the process proceeds to step S6.
In step S4, the position information of the work permission transmitter 6 is decoded from the received radio wave.
In step S5, it is determined whether or not an intruder other than the worker is present. When no intruder other than the worker is detected, the personal injury prevention procedure is terminated. When an intruder other than the worker is detected, the process proceeds to step S6. move on.

In step S6, the number flag is checked to determine whether or not it is the first detection of an intruder, and the process proceeds to step S7 for the first detection and proceeds to step S8 for the second detection.
In step S7, the number flag is set to 1, the position information is stored, and the personal injury prevention procedure is terminated.
In step S8, it is determined whether or not the difference between the stored position information and the current position information is greater than or equal to a predetermined threshold. If the difference is greater than or equal to the predetermined threshold, the process proceeds to step S9, where the difference is less than the predetermined threshold. When the process proceeds to step S10.
In step S9, it is determined that a train has entered and the personal injury prevention procedure is terminated.
In step S10, it is determined that a person has entered the track and commands the train control device 7 to stop the train.

  The personal injury prevention system according to the present invention detects intruders by distinguishing them from trains and workers, and can detect an intrusion into a track instantly and reliably without the need to find a person who finds a fall or an emergency stop button. The time from an intrusion event occurrence to an emergency train stop instruction can be shortened. This shortening of the time will reduce the incidence of personal injury and lead to respect for human life, and it will also be possible to prevent disruption of the diagram.

It is a figure which shows schematic structure of the personal injury prevention system which concerns on this invention. It is a block diagram of the leakage electric field transmission / reception apparatus which concerns on this invention. It is a figure which shows a mode that a leaked electromagnetic wave is received. It is a figure which shows an example of the detection concept of the intrusion position which concerns on this invention. It is a figure which shows the specific example of the transmission signal which concerns on this invention. It is a functional block diagram of the personal injury prevention apparatus which concerns on this invention. It is a flowchart which shows the personal injury prevention procedure performed with the personal injury prevention apparatus which concerns on this invention.

Explanation of symbols

  1 platform, 2 tracks, 3 intrusion detection device, 4 RFID tag, 5 worker, 6 work permission transmitter, 7 train control device, 8 leakage electric field transmission / reception device, 9 personal injury prevention device, 11 transmission side leakage transmission path, 12 reception Side leakage transmission path, 13 RF module, 14 sensor card, 15 transmission side terminator, 16 reception side terminator, 21 reference clock generation means, 22 switch means, 23 control means, 24 transmission spread spectrum signal generation means, 25 detection means, 26 Reference spread spectrum signal generation means, 27 correlation means, 31 position information acquisition means, 32 worker confirmation means, 33 position information storage means, 34 train / person distinction means, 35 train confirmation means, 36 train stop means.

Claims (3)

Transmission side leakage transmission path and reception side leakage transmission path disposed on both sides of the line on which the train enters, an RF module that generates a transmission spectrum spread signal and transmits it to the transmission side leakage transmission path, and changes in the received leakage electric field In a personal injury prevention system with a sensor card that analyzes and identifies the location of intruders,
A personal injury prevention system characterized in that an emergency stop is instructed that there is an intruder when the difference in the position of the intruder identified before and after a predetermined period is less than a predetermined threshold.   2. The personal injury prevention system according to claim 1, wherein when the difference between the positions of the intruders identified before and after a predetermined period is equal to or greater than a predetermined threshold, it is determined that the train has entered.   The electric lines of force from the transmitting side leaky transmission line to the receiving side leaky transmission line exist in a semi-cylindrical space with the ground on which the line is laid, and the height of the semi-cylindrical space is the platform. The personal injury prevention system according to claim 1, wherein the personal injury prevention system is lower than the height of the personal injury accident.

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